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(No Model'.) G. D. SANFORD.

HOT AIR FURNACE.

Patented June 19, 1888.

Fly 1 Inentor': 7

witnesses,-

UNITED STATES- PATENT OFFICE.

GEORGE D. SANFORD, OF PEEKSKILL, NEW YORK.

HOT-AIR FURNACE.

SPECIFICATION forming part of Letters Patent No. 384,789, dated June 19, 1888.

Application filed December 28, 1887. Serial No.259fl52. (No model.)

To aZZ whom it may concern.-

furnaces. The arches D, answering the double purpose of draft-fines and radiators, spring Be it known that I, GEORGE D. SANFORD, from the fines f upward, uniting over the dome a citizen of the United States, residing at a, substantially in the manner shown, the 5 Peekskill, in the county of Westchester and arches having a curve on the under side that 5 State of New York, have invented new and willprevent the accumulation of ashes on their useful Improvements in Hot-Air Furnaces, of inner surfaces-that is, from the apex m, Fig. which the following is a specification. 1, the slope of the arches to their bases is such My invention has relation to heating=furas to render them practically self-cleaning, as 6Q naces that areinclosed either in metal casings their pitch will prevent any gathering of partito or with brick walls, the air to be warmed becles thereon in masses. lVhere the arches ining drawn through the inclosures and becomtersect at their tops I place the outlet h, which ing heated by contact with the radiating-suraffords a convenient means of leading the faces of the furnace, and it has for its objects, smoke-pipe in any direction to the chimney. 6 first, the provision of compact, simple, and in- These'arches I also provide with outlets z i z '5,

expensive means for securing an equal distrihaving, preferably, the same cross-sectional bution of drafts and consequent complete comarea of the arches and being widened and bustion of fuel and the light gases and partiflanged at their tops similarly to the fluesf. cles arising therefrom; second, a uniform heat When using the heater in its simplest form, 70 ing of all the radiating-surfaces of the furnace these outlets are closed; but when it is desirand a consequent uniform and complete warmable to increase the radiating capacity of the ing of the air coming in contact therewith, heater these openings serve to receive the feet and, third, means for providing a direct draft k k k k, Figs. 1 and 5, of a radiating-ring, E, in any direction from the furnace. My means which is shown in cross-section in Fig. 4 and 75 for attaining said objects, as well as other ads in plan by Fig. .5.

' vantages to be explained, will be fully de- Now, it is obvious that, having the flues f scribed in the following specification,of which opening from the combustion-chamber at reguthe accompanying drawings form a part. lar intervals and communicating through the Figure 1 represents an elevation of a comarches D to the centrally-located exit h, an al- 8 plete furnace without any casing. Fig. 2 is an most absolutely uniform spreading of the fire o elevation of fire-pot, combustion-chamber, and within the furnace must result, and a uniform arching radiators. Fig. 3 is a plan through heating of the chamber C,,dome a,and theradithe line as, Fig. 1. Fig. 4 represents a section ators above them is unavoidable. It follows of the radiating-ring E. Fig. 5 represents a that if the admission of the outer air to within 8 plan of the ring E. the casing is given an equal and uniform dis- 3 5 In. the various figures, A represents the ashtribution its uniformheating is bound to take box; B, the fire-pot; O, the combustion-champlace. Even in the absence'of unusual pre= ber, provided with adome, c1.,and D andEdraftcautions to obtain such a uniform distribution flues and radiators.- b is the fire-door to chamof the incoming air the arrangements of the 0 ber O, and c the opening or doorway to the radiating'surfaces are such as to make it im 0 ash-box A. (1 represents a dust-flue leading possible for any currents to pass throughwithfrom the ash-box A through the fire-door openout becoming well warmed. ing 72 to the flue e. It will also be observed that, while the ar- The chamber 0 isprovided with projecting rangement of the fines and radiators is such as 95 flues f f f, jutting from the sides, their top to insure complete consumption of all the conn 4 5 edges being widened and provided with rising bust1ble particles of the fuel, in ascending the flanges, as shown at f f f Fig 3, furnishheat w1ll be taken up by the abundant iron ing receptacles for the feet of the radiator: surfaces, with which it cannot escape contact, archesD, as in Figs. 1 and 2, the widened surbefore it can pass out to the chimney through 00 faces and rising flanges affording ample means the outlet h. As will be seen, these results for a close cement joint. This chamber is likeare all obtained without undue obstructions to wise provided with adome, a, common to such the drafts and with no troublesome combinations of dampers and regulators.

In the construction of these furnaces, so long as I embody the principles of my invention, I do not wish to be restricted to the particular forms herein shown and described.

Having described myinvention,whatIclaim, and desire to secure by Letters Patent, is

1. In a hot-air furnace, the combination, with a fire-chamber provided with side flues,f, and a dome, a, of the radiator D, consisting of tubular arches resting upon the side fines, f, and doorway b, and uniting centrally above the dome a, Where they form a chamber which is provided with a pipeaim, substantially as herein shown and described.

WVitnesses:

CYRUS REYNOLDS, EUGENE B. HILL. 

